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root/Development/ray/src/hd/rholo4.c

Comparing ray/src/hd/rholo4.c (file contents):
Revision 3.1 by gregl, Fri Oct 31 10:23:29 1997 UTC vs.
Revision 3.7 by gregl, Thu Nov 20 18:07:00 1997 UTC

#	Line 10 | Line 10 | static char SCCSid[] = "$SunId$ SGI";
10
11		#include "rholo.h"
12		#include "rhdisp.h"
13	+	#include <sys/uio.h>
14
15	+	#ifndef HDSUF
16	+	#define HDSUF   ".hdisp"
17	+	#endif
18
19	<	open_display(dname)             /* open a display process */
19	>	static int      inp_flags;
20	>	static int      dpd[3];
21	>	static FILE     *dpout;
22	>
23	>
24	>	disp_open(dname)                /* open the named display driver */
25		char    *dname;
26		{
27	<	error(INTERNAL, "display process unimplemented");
27	>	char    dpath[128], *com[3];
28	>	int     i;
29	>
30	>	#ifdef DEVPATH
31	>	sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
32	>	#else
33	>	sprintf(dpath, "dev/%s%s", dname, HDSUF);
34	>	#endif
35	>	com[0] = dpath; com[1] = froot; com[2] = NULL;
36	>	i = open_process(dpd, com);
37	>	if (i <= 0)
38	>	error(USER, "cannot start display process");
39	>	if ((dpout = fdopen(dup(dpd[1]), "w")) == NULL)
40	>	error(SYSTEM, "cannot associate FILE with display pipe");
41	>	inp_flags = 0;
42	>	/* write out hologram grids */
43	>	for (i = 0; hdlist[i] != NULL; i++)
44	>	disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
45	>	disp_flush();
46		}
47
48
49	+	disp_packet(p)                  /* display a packet */
50	+	register PACKHEAD       *p;
51	+	{
52	+	disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
53	+	}
54	+
55	+
56		disp_check(block)               /* check display process */
57		int     block;
58		{
59	<	return(1);
59	>	MSGHEAD msg;
60	>	int     n;
61	>	char    *buf = NULL;
62	>
63	>	if (dpout == NULL)
64	>	return(-1);
65	>	/* flush display output */
66	>	disp_flush();
67	>	/* check read blocking */
68	>	if (block != (inp_flags == 0)) {
69	>	inp_flags = block ? 0 : FNONBLK;
70	>	if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
71	>	goto fcntlerr;
72	>	}
73	>	/* read message header */
74	>	n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
75	>	if (n != sizeof(MSGHEAD)) {
76	>	if (n >= 0)
77	>	error(USER, "display process died");
78	>	if (errno != EAGAIN & errno != EINTR)
79	>	goto readerr;
80	>	return(2);              /* acceptable failure */
81	>	}
82	>	if (msg.nbytes) {               /* get the message body */
83	>	buf = (char *)malloc(msg.nbytes);
84	>	if (buf == NULL)
85	>	error(SYSTEM, "out of memory in disp_check");
86	>	if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
87	>	goto fcntlerr;
88	>	if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
89	>	goto readerr;
90	>	}
91	>	switch (msg.type) {             /* take appropriate action */
92	>	case DR_BUNDLE:
93	>	if (msg.nbytes != sizeof(PACKHEAD))
94	>	error(INTERNAL, "bad DR_BUNDLE from display process");
95	>	bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
96	>	break;
97	>	case DR_NEWSET:
98	>	if (msg.nbytes % sizeof(PACKHEAD))
99	>	error(INTERNAL, "bad DR_NEWSET from display process");
100	>	disp_result(DS_STARTIMM, 0, NULL);
101	>	bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
102	>	disp_result(DS_ENDIMM, 0, NULL);
103	>	disp_flush();
104	>	break;
105	>	case DR_ADDSET:
106	>	if (msg.nbytes % sizeof(PACKHEAD))
107	>	error(INTERNAL, "bad DR_ADDSET from display process");
108	>	disp_result(DS_STARTIMM, 0, NULL);
109	>	bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
110	>	disp_result(DS_ENDIMM, 0, NULL);
111	>	disp_flush();
112	>	break;
113	>	case DR_DELSET:
114	>	if (msg.nbytes % sizeof(PACKHEAD))
115	>	error(INTERNAL, "bad DR_DELSET from display process");
116	>	bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
117	>	break;
118	>	case DR_ATTEN:
119	>	if (msg.nbytes)
120	>	error(INTERNAL, "bad DR_ATTEN from display process");
121	>	/* send acknowledgement */
122	>	disp_result(DS_ACKNOW, 0, NULL);
123	>	return(disp_check(1));  /* block on following request */
124	>	case DR_SHUTDOWN:
125	>	if (msg.nbytes)
126	>	error(INTERNAL, "bad DR_SHUTDOWN from display process");
127	>	return(0);              /* zero return signals shutdown */
128	>	case DR_NOOP:
129	>	break;
130	>	default:
131	>	error(INTERNAL, "unrecognized request from display process");
132	>	}
133	>	if (msg.nbytes)                 /* clean up */
134	>	free(buf);
135	>	return(1);                      /* normal return value */
136	>	fcntlerr:
137	>	error(SYSTEM, "cannot change display blocking mode");
138	>	readerr:
139	>	error(SYSTEM, "error reading from display process");
140		}
141
142
143	<	disp_packet(p)                  /* display a packet */
144	<	register PACKET *p;
143	>	int
144	>	disp_close()                    /* close our display process */
145		{
146	+	int     rval;
147	+
148	+	if (dpout == NULL)
149	+	return(-1);
150	+	disp_result(DS_SHUTDOWN, 0, NULL);
151	+	fclose(dpout);
152	+	dpout = NULL;
153	+	return(close_process(dpd));
154	+	}
155	+
156	+
157	+	disp_result(type, nbytes, p)    /* queue result message to display process */
158	+	int     type, nbytes;
159	+	char    *p;
160	+	{
161	+	MSGHEAD msg;
162	+
163	+	if (dpout == NULL)
164	+	return;
165	+	msg.type = type;
166	+	msg.nbytes = nbytes;
167	+	fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
168	+	if (nbytes > 0)
169	+	fwrite(p, 1, nbytes, dpout);
170	+	}
171	+
172	+
173	+	disp_flush()                    /* flush output to display */
174	+	{
175	+	if (fflush(dpout) < 0)
176	+	error(SYSTEM, "error writing to the display process");
177		}

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